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246 Portable Anemometers. These instruments are extensively used in studying and controlling the ventilation of dwellings, public buildings, factories, mines, etc. The velocity of the air current is measured by means of a very light fan wheel, whose revolutions are recorded on a dial. This fan wheel is very delicate, the vanes being made of aluminum, and the axis of hard steel runs in j^wel bearings. The counting mechanism is enclosed in a dust-pro~f case, and can readily be thrown into or out of action by a disconnecting lever. The instrument is provided with a thumb- serew for attaching it to a rod for use in measuring the velocity of air currents at any point on the surface of the earth, mine shafts, in pipes, conduits or narrow channels. In this case the c -anting mechanism is thrown in or out of gear by pulling on cords of different colors. This A nemometer is carefully rated and supplied WITH A CORRECTION NUMBER. Anemometer, Counting up to 10,000, OOP ft. ; diameter of fan, Gin. ; complete, packed in polished wooden box, $3O.OO. The Brunton Patent Pocket Mine Transit. A pocket instrument which takes the place of a sighting compass, clinometer, prismatic compass, and an Abney level or Locke's level. Weight 8 ounces. Price, $2O.OO Brunton Mine Transit with leather sling case, . . . 22.25
247 NEW PARTS FOR OUR TRANSITS ANI> LEVELS LIABLE TO LOSS OR ACCIDENT. The following list of parts of our Transits and Levels can be supplied in emergency cases when it is impossible to send us the instrument. (Articles not given in this list cannot be furnished unless the instrument is sent. ) NOTE- As we make many styles and sizes of instruments, a mere description in your letter of what is wanted may not be sufficient. For this reason to prevent mistakes and loss of time we always require the serial number and size of the instrument, and a rough sketch when the list below and the names given in the cross-section cut on pages 29 and GO do not indicate the parts wanted. Sending the broken pieces will also help to identify the part and the size. We cannot undertake to work by sketch or measures, and only agree to send the parts mentioned in this list to fit as near as possible without having the instrument. (If we are to do the fitting to detached parts sent to us there will be an extra charge made for such final fitting in addition to the price given in the list below.) Parts marked thus(*) can be sent to fit approximately only. In all cases where single parts sent out such as a leveling or a tangent screw fits too tightly or too loosely a competent instrument maker should make the final fitting, and it is only when too far removed from one that a good local optician, jeweller or watch maker should do it. If there is no one to make the final fitting in the town or vicinity, send us with the order the parts, such as the bracket for which the new tangent screw is required, or the leveling head for leveling screws, or level mount- ing tubes, frames for glass shades, etc., for proper fitting. Under no circumstances ever detach a standard, center, horizontal circle, verniers, or level arms, etc., from the instrument. Before ordering an article from the list below, please read Notes A. B. C. etc., page 249. When applying any personal treatment to parts requiring care, it will be well to first read the various chapters on ' Care of our instruments," etc., on pages 10 to 22 of our Manual, which is sent out with each instrument purchased also the various notes appended to this list. Emery must never be used in any form under any circumstances for fitting as this would spoil the part treated. Parts sent to us by mail should be REGISTERED to ensure delivery. The prices below do not include registration. Add 1C cents if registration is desired. In order to avoid opening accounts for small amounts, the price, including postage, (and registration if any ) should accompany the order. NEW PARTS FOR TRANSITS SL/B/FPT Tn For illustration see page 29. WITHOUT IVOT/CE Hood: (Cravenette is supplied for Transits, unless silk is specified) . Tripod: Price Postage Code $1.00 .04 Acerb (New box cannot be supplied without having the instrument.) Plumb bobs, see page 244. For Transits No. 1 and 5 use No. 213 2.00 .12 Ache 2,3,4,6 212. . 1.75 .09 Achor Plumb bob adjuster. ......... .15 .01 Acute Pocket magnifying glasses, see page 245. For all styles and sizes of Transit except No. 4 use No. 222 ... .90 .02 Adore For No. 4 use No. 221 . . . .60 .02 Aigre Set of rubber cushion* (4) for outside bottom of mahogany box .30 .02 Alcor Adjusting pins .......... .08 .01 Alpia <strong>Instrument</strong> packing piece (brass ring to screw instrument upon the slide board) 1.00 .10 Amber (For entire tripods see page 158O.) for instruments having four leveling screws ' " complete with bolts, nuts and washers bolt . @$.90) nut . . . . . . @ .35 see Note C [ washer 1. 2. 3. . . . .05) cap of aluminum .... leg full length, split, " extension (See Note D) shoe 1. 2. 3. V clamp for extension leg (See Note C ) Tripod head (See Note B ) 1.50 3.00 4.25 .35 1.00 .35 .50 .04 .02 .01 .10 Ex Ex .06 .07 Babel Dacca Badge Bafta* Balmy Banco Bandy Basis Baton Bavin
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ENGIN. LIBRARY UC-NRLF STANDARD INS
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PREFACE. THE instruments enumerated
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DESCRIPTION OP THE Essential Featur
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Tangent Screws. These are made of A
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The Finish. It is a well-known fact
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11 whatever. As a rule more harm th
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13 has sufficiently developed to im
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15 ordinary instruments, but it mus
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17 frame, and apply another drop of
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19 The finer and finest classes of
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21 applied with an adjusting pin ab
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23 adjustment of the telescope in t
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25 Owing to the many improvements m
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27 Engineers 9 Instruments and Thei
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ITrfpodfead 2 // Bolt 3 // >/ Mf J
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In practice, however, many engineer
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34 The Pancratic, or Changeable Pow
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the 130 division, and moved on unti
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38 Graduation Reading to 2O". A 15
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Decimal Vernier Graduation. For rai
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HORIZONTAL CIRCLE HORIZONTAL CIRCLE
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44 line of collimation of the teles
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46 Obviously then, the number of wh
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48 Gradienter Screw Table I. Factor
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50 The subjoined table affords a re
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52 Plumbing and Centering Arrangeme
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54 To make the adjustment for Paral
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56 capstan-headed screw at left to
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58 To adjust the line of collimatio
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62 The Adjustment of the Wye Level.
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On slightly rising ground locate fo
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(5.) Astronomical Triangle. The hei
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68 From the -(- sign of the " diffe
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70 Degree of Precision Required. (1
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72 tions for refraction, using the
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74 Correction to the Mean Refractio
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76 Table H. Coefficients showing th
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78 To Find the Meridian from " Pola
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80 REMARKS. If the instrument is no
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82 These devices are being more and
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84 c. Directions. For finding the S
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6. Directions. For reducing the nor
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88 On Stadia Measurement. Written e
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90 included between this and the ot
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92 Jug, R, of the rod AB is the dif
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94 gent screw of the main telescope
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96 zero when plates are leveled up
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i I * 2 I! all 35 e 5c u fcc - = H
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100 Berger Short Focus Lenses. A se
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102 NOTE. In selecting instruments
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RIBBING PARTS OF INSTRUMENTS. Patro
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The Berber Complete Engineers' and
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[Patented) The Berber Complete Mine
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11(5 5 O o to tO u tO CM in in in o
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118 n ai in Spirit Levels. For the
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l, 33 120
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122
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14 124 C. L,. BEKGEK & SONS. BOSTON
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1 5" AND 1 7|" C. t. BKKGER & SONS.
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C. 1-28 BEKGEU & SONS. Monitor Type
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130 The Berger 18 MONITOR TYPE WYE
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1 18 132 C. I*. BERGER & SONS, BOST
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18 134 II ENGINEERS' WYE LEVEL. lev
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136 18" HYDROGRAPHER'S WYE LEVEL Ha
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138 Reversion Level. Applicable to
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140 The Telescope will be invariabl
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142 THE GEODETIC LEVEL. In response
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144 COAST SURVEY PRECISE LEVEL The
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146 PLANE TABLE This instrument, as
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61" 150 ENGINEERS' AND SURVEYORS' T
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No. 1 a. 6 1 4 in. at edge of gradu
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No. I a. T 4 in. at edge of graduat
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No. 1 c. 154 C. L. BERGER & SO>S in
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No. 1 c, Style p. in. at edge of jr
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. 1 f. is made by C. L. Berger & So
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160 C. L. BEKGEK & SONS. MONITOR TY
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162 64 SURVEYORS' TRANSIT No. 1 s.
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5^" 164 C. L. BERGER & SONS, BOSTON
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166 C. L. BERGER & SONS. BOSTON 5|"
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5|" 168 ENGINEERS' AND SURVEYORS' T
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The Surveyors' Solar Attachment. Pl
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172 The Berger Solar Attachment Att
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174 Davis' Patent Solar Attachment.
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176 THE 5|" MOUNTAIN TRANSIT. This
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178 The 41" Mountain and Mining: Tr
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4|" 180 C. L,. BERGER & SONS. BOSTO
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182 The 4" Mountain, Mining and Rec
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184 The 4" Complete Transit- Theodo
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186 4>4 " Complete Mine Transit No.
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^ 188 t4 Mining Transits. All of th
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The 190 See M Fig. 1. Berger Patent
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03 192 Complete Mining Transit No.
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|S go Complete Wet-Mine Transit No.
Page 202 and 203: 196 Different Types of Vertical Arc
Page 204 and 205: :i98 Edge G-racl nation for Vertica
Page 206 and 207: The Open-Frame Protected Vertical C
Page 208 and 209: 202 C. L. BEKGKK & SONS. Flexible J
Page 210 and 211: S fa 204 Style of trivets used with
Page 212 and 213: 200 Patented. The Lateral Adjuster
Page 214 and 215: Mining Transit. Interchangeable wit
Page 216 and 217: 210 Tunnel Transits. Xo. 1C a Tunne
Page 218 and 219: 212 Triaiigulatioii Transit- Theodo
Page 220 and 221: No. lib. 214 Complete Double Opposi
Page 222 and 223: 210 No. 11 m. 7-iiich Complete Tran
Page 224 and 225: 218 No. llg, 7-inch Complete Triang
Page 226 and 227: 220 No. 12. 8-iiich Transit for Tri
Page 228 and 229: SPECIFICATIONS : No. 15 Alt-Azimuth
Page 230 and 231: No. 15 b. Alt.-Azimuth. 224 Alt. -A
Page 232 and 233: Portable Transit Instrument for Lat
Page 234 and 235: 228 Reflecting Circle. Artificial H
Page 236 and 237: 230 Current Meters, The types of cu
Page 238 and 239: 232 Current Meters No. V and VI, As
Page 240 and 241: 234 Plain Polar Plaiiimeter. This P
Page 242 and 243: 236 Leveling Rods No. 145 No. 147 N
Page 244 and 245: Paine's Steel Tape Measures. & inch
Page 246 and 247: 240 Surveyors' Chain Tapes. Heavy J
Page 248 and 249: 2-12 Standard Steel Tape Measures.
Page 250 and 251: No. 210. Plummet Lamp. tfo. 212. 24
Page 254 and 255: PRICES SUBJECT TO CHANGE WITHOUT NO
Page 256 and 257: J Tripod Head 2 // Bolt 3 * .* Nut
Page 258 and 259: Levels, Locke's Hand Reversion Revo
Page 260 and 261: C. Li. Berger & Sons' Bevel-Limb Tr
Page 262 and 263: 0) O (^ c CL 0? Z O (0 O K lu ffi C
Page 264 and 265: O CO K III III These prices do not
Page 266 and 267: ord (In whether . 4 O ~ bJD p,"* 3,
Page 268 and 269: a -iQ. Q u u o 0) o 0) U O U CO o C
Page 270 and 271: These prices do not include bag (SI
Page 272 and 273: Q III o o z o u o o U Ott bl CD O U
Page 274: o O (0 ui y O J O Q. O U 5> OC os .
Page 279: 800290 I A 33012 Engineeringlibrary
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