Beyond the introduction of the spider line it is unnecessary to mention the various steps by which the Gascoigne micrometer assumed the modern forms now in use, or to describe in detail the suggestions of Hooke, 4 Wren, Smeaton, Cassini, Bradley, Maskelyne, Herschel, Arago, Pearson, Bessel, Struve, Dawes, &c., or the successive productions of the great artists Ramsden, Troughton, Fraunhofer, Ertel, Simms, Cooke, Grubb, Clarke and Repsold.
It depends if you're going for a long shot with power or a short shot with power. I'm going to assume you're going for the long shots. Take about 5 steps back at a 7 o clock aâ¦ngle to the ball. Take 3 quick, tiny steps then take a really fast run up.
Regular Oblique from an Airplane. 1  Shot from 1,000' to 5,000' above the ground. 2  Shot at a 30 to 60 degree angle from an open window of the airplane. 3  This is a good way to show areas from 20 acres up to 6 square miles.  Limitations - Not allowed within 5 miles of major airports while they are using runways toward the site.