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118 n ai in Spirit Levels. For the benefit of our patrons we enumerate below the principal Spirit Levels we are prepared to supply at short notice. They are made by us, and are of the same superior quality as those furnished with our instruments. In the list below we give length, diameter, and degree of sensitiveness. They are graduated, as a rule, as shown above. Levels different in size from this list can be made to order only, and will be furnished only when order is accompanied with the tube or mounting for which one is intended, and also stuting the kind of instrument it isfor, and the degree of sensitiveness desired. We will positively not make any levels upon written dimensions only, but require the tube to be sent in all cases, as otherwise we will not be respon- > C. L. Berger & Sons' Quick Leveling Attachment. Shown as applied to Lercl* and Transits. (See page 45 of Manual.) Code Word Entroba for use with Transit No. 4 $2O.OO Epilobium for all other sizes 15.OO
Code word . . Oakadum. 119 Spirit-Level on Metal Base. Ground Spirit-Level, one division of level about 20 sec. of arc ; mounted on 8-inch metal base, provided with a handle. Level adjustable. In case. Price, $14.OO These levels are extensively used in machine shops for leveling up and testing fine machinery, etc., also used for leveling up apparatus in observatories, physical and chemical laboratories, and for setting weirs, etc. Code Word Oakesia. Brass or nickel-plated. Locke's Hand-Level. In case Price $8.OO NOTE. This consists of a brass tube 6 inches long, with a small level mounted on its top to the left of its center near the object end. Underneath the level is a horizontal wire stretched upon a frame. This frame is made adjustable by a screw and a spring working against each other, or by two opposing screws placed at the ends of the level mounting. In the tube directly below the level is placed a totally reflecting prism, acting as a mirror set at an angel of 45 to line of sight. The images of the bubble and wire are thus reflected to the eye. The prism divides the aperture in two halves, in one of which is seen the bubble and wire focussed sharply by a convex lens placed in the draw tube, while the other permits of an open view. Putting the instrument to the eye and raising and lowering the object-end until the bubble is bisected, natural objects can be seen through the open half at the same time, and approximate levels can then be taken. To prevent dust and dampness from entering the main tube, both the object and the eye ends are closed up with plain glasses. la preliminary work this is a very useful instrument. Hand-Level and Clinometer. Abney Level and Clinometer. Price $14.OO. NOTE. This instrument is similar to the Locke's hand-level, but the small spirit level mounted on top can be moved in the vertical plane and clamped to a dial graduated in single degrees, thus the angles of slopes, etc., can be measured also. Code Word . . . Oleander.
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ENGIN. LIBRARY UC-NRLF STANDARD INS
Page 9 and 10:
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
Page 74 and 75: 68 From the -(- sign of the " diffe
Page 76 and 77: 70 Degree of Precision Required. (1
Page 78 and 79: 72 tions for refraction, using the
Page 80 and 81: 74 Correction to the Mean Refractio
Page 82 and 83: 76 Table H. Coefficients showing th
Page 84 and 85: 78 To Find the Meridian from " Pola
Page 86 and 87: 80 REMARKS. If the instrument is no
Page 88 and 89: 82 These devices are being more and
Page 90 and 91: 84 c. Directions. For finding the S
Page 92 and 93: 6. Directions. For reducing the nor
Page 94 and 95: 88 On Stadia Measurement. Written e
Page 96 and 97: 90 included between this and the ot
Page 98 and 99: 92 Jug, R, of the rod AB is the dif
Page 100 and 101: 94 gent screw of the main telescope
Page 102 and 103: 96 zero when plates are leveled up
Page 104 and 105: i I * 2 I! all 35 e 5c u fcc - = H
Page 106 and 107: 100 Berger Short Focus Lenses. A se
Page 108 and 109: 102 NOTE. In selecting instruments
Page 110: RIBBING PARTS OF INSTRUMENTS. Patro
Page 115: The Berber Complete Engineers' and
Page 119: [Patented) The Berber Complete Mine
Page 122 and 123: 11(5 5 O o to tO u tO CM in in in o
Page 126 and 127: l, 33 120
Page 128 and 129: 122
Page 130 and 131: 14 124 C. L,. BEKGEK & SONS. BOSTON
Page 132 and 133: 1 5" AND 1 7|" C. t. BKKGER & SONS.
Page 134 and 135: C. 1-28 BEKGEU & SONS. Monitor Type
Page 136 and 137: 130 The Berger 18 MONITOR TYPE WYE
Page 138 and 139: 1 18 132 C. I*. BERGER & SONS, BOST
Page 140 and 141: 18 134 II ENGINEERS' WYE LEVEL. lev
Page 142 and 143: 136 18" HYDROGRAPHER'S WYE LEVEL Ha
Page 144 and 145: 138 Reversion Level. Applicable to
Page 146 and 147: 140 The Telescope will be invariabl
Page 148 and 149: 142 THE GEODETIC LEVEL. In response
Page 150 and 151: 144 COAST SURVEY PRECISE LEVEL The
Page 152 and 153: 146 PLANE TABLE This instrument, as
Page 154 and 155: 61" 150 ENGINEERS' AND SURVEYORS' T
Page 156 and 157: No. 1 a. 6 1 4 in. at edge of gradu
Page 158 and 159: No. I a. T 4 in. at edge of graduat
Page 160 and 161: No. 1 c. 154 C. L. BERGER & SO>S in
Page 162 and 163: No. 1 c, Style p. in. at edge of jr
Page 164 and 165: . 1 f. is made by C. L. Berger & So
Page 166 and 167: 160 C. L. BEKGEK & SONS. MONITOR TY
Page 168 and 169: 162 64 SURVEYORS' TRANSIT No. 1 s.
Page 170 and 171: 5^" 164 C. L. BERGER & SONS, BOSTON
Page 172 and 173: 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.
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196 Different Types of Vertical Arc
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:i98 Edge G-racl nation for Vertica
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The Open-Frame Protected Vertical C
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202 C. L. BEKGKK & SONS. Flexible J
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S fa 204 Style of trivets used with
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200 Patented. The Lateral Adjuster
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Mining Transit. Interchangeable wit
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210 Tunnel Transits. Xo. 1C a Tunne
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212 Triaiigulatioii Transit- Theodo
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No. lib. 214 Complete Double Opposi
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210 No. 11 m. 7-iiich Complete Tran
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218 No. llg, 7-inch Complete Triang
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220 No. 12. 8-iiich Transit for Tri
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SPECIFICATIONS : No. 15 Alt-Azimuth
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No. 15 b. Alt.-Azimuth. 224 Alt. -A
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Portable Transit Instrument for Lat
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228 Reflecting Circle. Artificial H
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230 Current Meters, The types of cu
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232 Current Meters No. V and VI, As
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234 Plain Polar Plaiiimeter. This P
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236 Leveling Rods No. 145 No. 147 N
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Paine's Steel Tape Measures. & inch
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240 Surveyors' Chain Tapes. Heavy J
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2-12 Standard Steel Tape Measures.
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No. 210. Plummet Lamp. tfo. 212. 24
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246 Portable Anemometers. These ins
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PRICES SUBJECT TO CHANGE WITHOUT NO
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J Tripod Head 2 // Bolt 3 * .* Nut
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Levels, Locke's Hand Reversion Revo
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C. Li. Berger & Sons' Bevel-Limb Tr
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0) O (^ c CL 0? Z O (0 O K lu ffi C
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O CO K III III These prices do not
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ord (In whether . 4 O ~ bJD p,"* 3,
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a -iQ. Q u u o 0) o 0) U O U CO o C
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These prices do not include bag (SI
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Q III o o z o u o o U Ott bl CD O U
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o O (0 ui y O J O Q. O U 5> OC os .
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800290 I A 33012 Engineeringlibrary
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