TM 8-227: Methods for Laboratory Technicians | T.REX ARMS Field Manual Vault

TM 8-227 Methods for Laboratory Technicians

TM 8-227

Methods for Laboratory Technicians

Army · TM · Jan 1941 · 466 pages

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TM 8-227 c 3 TECHNICAL MANUAL METHODS FOR LABORATORY TECHNICIANS 4 ey CaS ida Measetominer No. 2 Waaninerpn 25,4), C., 1 April 1944. TM 8-227, 17 October 1941, is changed as follows: a 10. Use. ae. ae! * * * * a * 2 d. Adjustment of focus (Superseded).—The number on the objective indicates its "equivalent focal length" in millimeters. If the 16-mm objective were a simple converging lens, the equivalent focal length would also be its working distance (that is, the distance above the object when the lens is in focus) but, for a compound objective, the working distance is always much less than the equivalent focal length. For example, it will be found that the working distance of the 16-mm objective is about 5 mm, that of the 4-mm objective, less than 1 mm, and that of the 1.9-mm objective, less than 0.2 mm.

DesignationTM 8-227

EditionJan 1941

StatusSuperseded

Pages466

FunctionMedical TCCC

CollectionHistoric

Public domain (U.S. Government work)

References 6

TM 8Not in the Vault
TM 8227Not in the Vault
TM 8-22Not in the Vault
TM 8-24Not in the Vault
TM 5Not in the Vault