The projector should stand on a plinth of about 4-5' in heig

The projector should stand on a plinth of about 4-5' in height (the ideal height would place the lens of the projector at approximately half the height of the projected image).[Metric:1m - 1.5m]
The ideal projection distance between projector lens and wall is between 30' and 50' feet.The ideal frame height at the wall is between 7' and 11' (ie giving an ideal ratio between beam length and frame height of between 4.5 and 5 to 1).The base of the frame should be about 1' from the floor.[Metric:9m - 17m throw,2m - 3.5m frame height,30cm from floor]
The light of the beam is visible through its contact with tiny particles in the air,be they from dust,humidity or smoke.The most effective and controllable method of ensuring visibility is by hiring or borrowing a "Hazer".These can usually be rented by the day from theatrical or lighting supply firms.See,for example,the Martin/Jem ZR24/7 Hazer.A Hazer fills the projection space with a safe,odorless haze similar in appearance to a sea mist,which is extremely effective in rendering the beam of light palpable and visible.

The projector should stand on a plinth of about 4-5' in height (the ideal height would place the lens of the projector at approximately half the height of the projected image).[Metric:1m - 1.5m]
投影仪（放映机）应置于4至5英尺高的底座上（理想高度应使投影仪的镜头大约位于投出影像高度的二分之一）.（公制：1-1.5米）
The ideal projection distance between projector lens and wall is between 30' and 50' feet.The ideal frame height at the wall is between 7' and 11' (ie giving an ideal ratio between beam length and frame height of between 4.5 and 5 to 1).The base of the frame should be about 1' from the floor.[Metric:9m - 17m throw,2m - 3.5m frame height,30cm from floor]
理想的从镜头到墙壁的投影距离是在30至50英尺之间.墙上的画面大小的理想尺寸应介于7到11英尺（例如,理想的宽长比应介于4.5或5比1）.画面下端应距地面一英尺.（公制：9米 - 17米投影距离,2-3.5米画面高度,距地面为30厘米）
The light of the beam is visible through its contact with tiny particles in the air,be they from dust,humidity or smoke.The most effective and controllable method of ensuring visibility is by hiring or borrowing a "Hazer".These can usually be rented by the day from theatrical or lighting supply firms.See,for example,the Martin/Jem ZR24/7 Hazer.A Hazer fills the projection space with a safe,odorless haze similar in appearance to a sea mist,which is extremely effective in rendering the beam of light palpable and visible.
投影的光束由于空气中的微粒而可见,微粒可能是尘埃、湿气或烟尘.使光束可见的最有效也是最容易控制的办法,是使用或借用一台“喷雾器”.这种一起通常可以在当天从舞台或灯光设备供应商那里租到.比如,Martin/Jem ZR24/7 型号的喷雾器.喷雾器可以喷出安全、无味的雾气,这种雾气很像海上的雾气,可以有效地使人们看到明显光束.