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14 124 C. L,. BEKGEK & SONS. BOSTON 111 MONITOR TYPE DUMPY LEVEL. 2 Tubular Bar A sturdy, compact instrument of precision. For use in the Army, about Fortifications, in Cities, Construction of Highways, Railroads, Tiiimels, Mines, and about Factories, etc., where a smaller size and less weight is desirable. In answer to many inquiries for a Dumpy Level to take the place of the frail and often badly designed 14 inch wye Levels, commonly found on the market, we are offering this most advanced type. The Monitor Type Dumpy Level is made to last, its vital parts are strongly built in a stubby style. The center flange and the clamp and tangent screw are carried up very far into the hollow bar thus reducing the height of instrument to the tripod head and are protected from rain, dust, grit and injury. All this has been ac- COmplished without sacrificing the standard long center with which all of our instruments have always been identified, thus adding to the stability of the instrument. The hollow bar is tubular in form and therefore is deflection resisting. A far greater amount of rigidity will be found in the Monitor type level bars which are greatly superior to those of the older familiar forms of same weight. These bars are not affected by temperature changes owing to the free circulation of air through and around the bar. The telescope tube is made of a single casting and bored out to be truly cylindrical (not made of tubing, which is often Oval in form, See page 128). The leveling head is also of a single casting of improved form, so that the center will not bind in the socket from any strain exerted by the four leveling screws. Owing to the peculiar construction of the socket the center-clamp screw cannot exert any pressure upon the center after the instrument is clamped to the socket, thus leaving the bubble undisturbed. This Level will Avithstand all kinds of rough treatment when transported On muleback, over mountains, impassable roadsor throughthe wilderness. The adjustments are few, when Once made they are lasting and above all the instrument is dependable at all times and free from any tremor even in a strong wind. Its rounded forms, together with the fine, dark and durable wear resisting leather finish applied to the exterior surfaces, appeal to anyone in sympathy with advanced instrument design. The telescope is erecting. 1 Telescope Erecting SPECIFICATIONS: 14# inches long, aperature 1^, power 30 dia. Focussing slide very long and provided with our collapsible dust guard, see page 128. Eye-piece with large flat field of view, provided with an improved screw arrangement permitting to focus the wires by simply turning its head slightly tO right Or left. The eye-piece cap is large in diameter and made so that it affords a protection to the observer's eye in a glaring sun. It has been combined with a dust-guard which fully protects the eye-piece focussing slide. Spirit Level O inches long between centers of suspending arms. The spirit level is very sensitive and accurately ground to a true curvature and barrel shape. <strong>Center</strong> of hard bell metal. Clamp and Tangent Screw. Mahogany box provided with strap, lock, and hooks, containing sunshade, wrench, screwdriver and adjusting pins. Weight of instrument 9/2 Ibs. Weight of tripod about 9 Ibs. Gross weight of instrument securely packed for shipment in two boxes about 40 Ibs. Code word : Alodol Price as above $ 1 15 Extras to 14^ inch Monitor Type Dumpy Level. Stadia Wires fixed in ratio 1 : 100 *:J.oo Steel <strong>Center</strong> running in a cast iron socket to insure freest motion with perfect fit 10.00 Fine mirror mounted in case with universal joint. (This is readily attachable to either side of the instrument and facilitates the reading of the bubble on soft ground without . . . stepping aside) 10.00 Gossamer water-proof bag to protect the instrument in case of rain or dust i.oo Bottle of fine watch-oil to lubricate the lever center .... .35 MONITOR TYPE DUMPY LEVEL. Inverting Telescope. Aperture, Power and Price same as above. For description and cut see pages 126-127. (Code word: Abardo.)
H i r * 2 5 "* i H } if if IM s ! 1 5 ? I? ? 14 C. I,. UKKGKJl & SONS. BOSTON ........ Code Words for 14^ iiu-h Dumpy levels, inch erecting telescope inch erecting telescope with fixed stadia wires Alodol Abadc'iio
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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
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 124 and 125: 118 n ai in Spirit Levels. For the
Page 126 and 127: l, 33 120
Page 128 and 129: 122
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|"
Page 174 and 175: 5|" 168 ENGINEERS' AND SURVEYORS' T
Page 176 and 177: The Surveyors' Solar Attachment. Pl
Page 178 and 179: 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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STANDARD - Survey Instrument Antique Center!

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